I do have it working now for sniffer config. Not sure it was absolutely necessary, but I did have to make an adapter that put a resistive load on the TxD line out of the TPDD. I may fiddle some more and see if it really was necessary. thanks all steve
On Sat, Jan 9, 2021 at 1:29 PM Scott McDonnell <[email protected]> wrote: > Wait…. > > > > http://tandy.wiki/TPDD > > > Cable > > The "RS-232C" interface to the TPDD is actually 5v TTL (0v to +5v), while > RS-232 serial ports use -12v to +12v. So the cable isn't just a cable, it > has electronics inside the DB25 plug to convert the signal levels between > TTL and RS-232. > > > > > > According to that, the TPDD is 5V TTL level serial. Were you aware of that > already? > > > > > > *From: *Stephen Adolph <[email protected]> > *Sent: *Saturday, January 9, 2021 9:25 AM > *To: *[email protected] > *Subject: *[M100] connect TPDD to standard PC COM port > > > > Question for the crowd, > > > > Is there any issue with the signal levels on the TPDD not being truly > RS-232, and so it isn't able to signal on the line to the right levels and > hence cannot connect to a PC properly? > > > > What I am trying to do, since VirtualT seems to be unable to receive any > data (still can't get that to work), I've reverted to this > > > > M100 <------> PC COM1 (sniffer program) PC COM2 <------> TPDD > > > > I have the M100 <---> COM1 working > > > > I have COM2 <-----> NADSbox working > > > > But I cannot get COM2 <-----> TPDD working! > > > > > > I have a feeling it is the non-RS-232 signal levels of the TPDD. > > > > thx > > Steve > > >
